Gerbils In The Same Cage?

yes you can if they have been raised together. If you get two gerbils that are strange to each other. Keep them in separate cages (wire) close together so they can see and smell each other, otherwise they may fight to the death. When you think they will not fight try putting them together. I have introduced new companions by this method and has worked well.

Yeah I have two Gerbils that are girls that are doing well together but they've been together all their life

Yes two Females can be put together in the same cage like my two gerbils. But it will help if you have them together since they are babies.

can you put two males in the same cage?

You have to use the split cage method to get the gerbils used to each other.
To do this, have a wire seperator in the tank or cage, make sure it is secure because they can get through the smallest gaps.